单项选择题

The passage is mainly about ______.

A．how to keep fit
B．how to lose weight
C．the benefits brought about by regular exercises
D．exercises and diet
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单项选择题
What can be inferred from the passage
A．The slower people lose weight, the less likely they are to achieve their goals.
B．People who are on diet merely lose muscle and water.
C．Regular exercises may reduce the chance of getting certain chronic diseases.
D．Physical activity use muscle tissue as its main source of energy.
单项选择题
According to the passage, the greatest part of the solar energy that reaches the Earth is ______.
A．reflected back to space by snow and ice
B．concentrated at visible wavelengths
C．absorbed by carbon dioxide molecules
D．absorbed by atmospheric water vapor
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